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ZnO resistance card bismuth-coating device for DC system and bismuth-coating method thereof

A technology of DC system and resistance sheet, which is applied to the device for coating liquid on the surface, resistors, resistance manufacturing, etc. It can solve the problems of insufficient stability of coating amount and insufficient work efficiency, and achieve the goal of improving work efficiency and accurate dosage Effect

Active Publication Date: 2012-06-27
CHINA XD ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a ZnO resistive plate bismuth slurry device and process for a DC system. The device can overcome the problems of insufficient coating quantity and insufficient work efficiency in the prior art, and its process environment is significantly improved.

Method used

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  • ZnO resistance card bismuth-coating device for DC system and bismuth-coating method thereof
  • ZnO resistance card bismuth-coating device for DC system and bismuth-coating method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The method includes the following steps:

[0020] 1) Put the prepared slurry into the bismuth slurry storage mixing tank 2 and stir it evenly, then set aside;

[0021] 2) Place the ZnO resistor chip on the rotating tray 5, and turn on the preheating device 6 and the drying device 7 to preheat the ZnO resistor chip at a preheating temperature of 40°C;

[0022] 3) Turn on the exhaust and dust removal fan 4;

[0023] 4) Open the feed valve 8 and the gas supply and pressure reducing valve regulating system 3;

[0024] 5) Rotate the preheated ZnO resistor piece to the spray opening side, align the spray gun 1 with the ZnO resistor piece for spraying, and adjust the working pressure of the spray gun 1 to 0.3MPa;

[0025] 6) The residual material flows through the residual material hopper 12 through the residual material leakage hole on the rotating tray 5, and is recovered with the exhaust and dust removal fan 4;

[0026] 7) Rotate the sprayed ZnO resistor chip to the side of the drying ...

Embodiment 2

[0028] 1) Put the prepared slurry into the bismuth slurry storage mixing tank 2 and stir it evenly, then set aside;

[0029] 2) Place the ZnO resistor chip on the rotating tray 5, and turn on the preheating device 6 and the drying device 7 to preheat the ZnO resistor chip at a preheating temperature of 50°C;

[0030] 3) Turn on the exhaust and dust removal fan 4;

[0031] 4) Open the feed valve 8 and the gas supply and pressure reducing valve regulating system 3;

[0032] 5) Rotate the preheated ZnO resistor piece to the spray opening side, align the spray gun 1 with the ZnO resistor piece for spraying, and adjust the working pressure of the spray gun 1 to 0.4MPa;

[0033] 6) The residual material flows through the residual material hopper 12 through the residual material leakage hole on the rotating tray 5, and is recovered with the exhaust and dust removal fan 4;

[0034] 7) Rotate the sprayed ZnO resistor chip to the side of the drying device 7 and dry it at 70°C for 3 minutes to comp...

Embodiment 3

[0036] 1) Put the prepared slurry into the bismuth slurry storage mixing tank 2 and stir it evenly, then set aside;

[0037] 2) Place the ZnO resistor chip on the rotating tray 5, and turn on the preheating device 6 and the drying device 7 to preheat the ZnO resistor chip, the preheating temperature is 60℃;

[0038] 3) Turn on the exhaust and dust removal fan 4;

[0039] 4) Open the feed valve 8 and the gas supply and pressure reducing valve regulating system 3;

[0040] 5) Rotate the preheated ZnO resistor piece to the spray opening side, align the spray gun 1 with the ZnO resistor piece for spraying, and adjust the working pressure of the spray gun 1 to 0.5MPa;

[0041] 6) The residual material flows through the residual material hopper 12 through the residual material leakage hole on the rotating tray 5, and is recovered with the exhaust and dust removal fan 4;

[0042] 7) Rotate the sprayed ZnO resistor chip to the side of the drying device 7 and dry it at 80°C for 5 minutes to compl...

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Abstract

The invention discloses a ZnO resistance card bismuth-coating device for a DC system and a bismuth-coating method thereof. The device comprises a bracket, and a rotary tray and a heat-preservation dustproof cover which are fixed on the bracket, wherein the top end of the heat-preservation dustproof cover is provided with a preheating device and a drying device; the side end of the heat-preservation dustproof cover is provided with a temperature measurement and control terminal; a bismuth pulp storage and agitation tank is supported outside the heat-preservation dustproof cover; a feeding pipeline of the bismuth pulp storage and agitation tank is connected with a spray gun through a material valve; the spray gun corresponds to a side opening of the heat-preservation dustproof cover; and a residue hopper is arranged at the lower end of the rotary tray, and is connected with an exhaust and dedusting fan. The method comprises the following steps of: 1) placing material pulp into the bismuth pulp storage and agitation tank for later use; 2) preheating a ZnO resistance card; 3) starting the exhaust and dedusting fan; 4) opening the material valve and a gas supply and pressure reduction valve; 5) performing spraying; 6) recovering material residues; and 7) performing drying to finish the bismuth coating process. The device and the method have the advantages of stable coating weight, high working performance and remarkable improvement in process environment.

Description

Technical field [0001] The invention relates to a manufacturing process of a ZnO resistive sheet of a lightning arrester used in a direct current system, in particular to a bismuth slurry coating device and a bismuth coating method thereof in the manufacturing process of a ZnO resistive sheet used in the direct current system. Background technique [0002] The bismuth coating process is an important process for the manufacture of ZnO resistors for DC systems. It has a direct impact on the electrical performance and working efficiency of the ZnO resistors, especially the aging performance is more obvious, which in turn affects the design of lightning arresters for DC systems and use. The bismuth coating process is a process in which the bismuth paste is uniformly coated on the end face of the ZnO resistor according to the prescribed dosage, and it is required that the bismuth paste does not pile up, lack or flow. Commonly used methods include spraying, brushing, flow cloth, etc.,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01C17/00B05B13/02B05B15/04B05B15/00B05D3/02B05D3/00B05D1/02H01C7/12
Inventor 贺西民李刚王锋胡小定
Owner CHINA XD ELECTRIC CO LTD